CPC F16D 3/06 (2013.01) [C09D 7/61 (2018.01); C09D 179/08 (2013.01); C10M 103/06 (2013.01); C10M 107/44 (2013.01); C10M 111/04 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C23C 28/04 (2013.01); C10M 2201/0663 (2013.01); C10M 2217/0245 (2013.01); C10N 2050/023 (2020.05); F16D 2200/0021 (2013.01); F16D 2200/0034 (2013.01); F16D 2200/0052 (2013.01); F16D 2300/06 (2013.01); F16D 2300/10 (2013.01)] | 16 Claims |
1. A sliding spline shaft device for an automobile, the sliding spline shaft device comprising:
a male spline; and
a female spline that is fitted to the male spline in an axially slidable manner; wherein:
at least one of the splines has a surface processed layer comprising an undercoat layer, an intermediate layer containing a phosphate, and a topcoat layer containing a solid lubricant and a binder resin, in this order;
the undercoat layer comprises a diffusion layer, and a compound layer containing an iron nitride; and
the compound layer is porous.
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